A Tip on changing 3 phase AC motor rotation

td456

5 `% m3 N4 r  X4 HWe all know that if you want to change the rotation of a three  phase AC motor.
Just swap any of the two phase leads.
( ~# f0 f0 Z$ M3 h# pBut for VFD application you need to do the swap after the inverter.
& @& k$ C4 @4 M- B* T+ oIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.

- l5 b# s) z2 O: {9 V4 m+ N" ^As the principal of the VFD works, bascially from AC to DC, then DC to AC.
* a+ i9 m/ J: E* k- e' l4 }5 ?
The phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.

7 I7 n8 H2 L5 R% w4 C* e, I7 vThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.

jiodiangong

k vo0u8p["